wishinghand/triangle

Convert images to computer generated art using delaunay triangulation.

▲ Triangle

Triangle is a tool to create image arts using the delaunay triangulation technique. It takes an image as input and it converts to abstract image composed of tiles of triangles.

The technique

• First the image is blured out to smothen the sharp pixel edges. The more blured an image is the more diffused the generated output will be.
• Second the resulted image is converted to grayscale mode.
• Then a sobel filter operator is applied on the grayscaled image to obtain the image edges. An optional threshold value is applied to filter out the representative pixels of the resulting image.
• Lastly we apply the delaunay algorithm on the pixels obtained from the previous step.

blur = tri.Stackblur(img, uint32(width), uint32(height), uint32(*blurRadius))
gray = tri.Grayscale(blur)
sobel = tri.SobelFilter(gray, float64(*sobelThreshold))
points = tri.GetEdgePoints(sobel, *pointsThreshold, *maxPoints)

triangles = delaunay.Init(width, height).Insert(points).GetTriangles()

Installation and usage

$ go get github.com/esimov/triangle/cmd/triangle
$ go install

Supported commands

$ triangle --help

The following flags are supported:

Flag	Default	Description
in	n/a	Input file
out	n/a	Output file
blur	4	Blur radius
max	2500	Maximum number of points
points	20	Points threshold
sobel	10	Sobel filter threshold
solid	false	Solid line color
wireframe	0	Wireframe mode (without,with,both)
width	1	Wireframe line width

Setting a lower points value, the resulted image will be more like a cubic painting.

Here are some examples you can experiment with:

$ triangle -in samples/clown_4.jpg -out output.png -wireframe=0 -max=3500 -width=2 -blur=2
$ triangle -in samples/clown_4.jpg -out output.png -wireframe=2 -max=5500 -width=1 -blur=10

Below are some of the generated images:

License

This project is under the MIT License. See the LICENSE file for the full license text.